Arrangement of the filament for high-voltage incandescent electric lamps of high efficiency.



No. 860,601. PATENTED JULY 16; 1907.

G. GLOGAU. v ARRANGEMENT OF THE FILAMENT FOR HIGH VOLTAGE INGANDESGBNT HLHGTRIG LAMPS OF HIGH HFF1GIBNGY.-

APPLICATION FILED MAY 17. 1907.

4 SHEETS-SHEET l.

No. 860,601. PATENTED JULY 16, 1907.

o. GLOGAU. ARRANGEMENT OF THE FILAMENT FOR HIGH VOLTAGE INCANDBSCENT ELECTRIC LAMPS OF'HIGH EFFICIENCY.

APPLIOATION FILED MAY 17. 1907.

4 SHEETS-SHEET 2.

PATENTED JULY 16, 1907.

0. GLOGAU. ARRANGEMENTOF THE FILAMENT FOR HIGH VOLTAGE INCANDESCENT ELECTRIC LAMPS OF HIGH EFFICIENCY.

APPLICATION FILED MAY 17. 1907.

4 SHEETS-SHEET 3.

1 No. 860,601. PATENTED JULY 16, 1907.

G. GLOGAU. ARRANGEMENT OF THE FILAMENT FOR HIGH VOLTAGE INGANDESGENT ELECTRIC LAMPS OF HIGH EFFICIENCY.

APPLICATION FILED MAY 17. 1907- 4 SHEETS-SHEET 4.

62076 GZoga u/ WITNESSES INVENTOR UNITED STATES PATENT. OFFICE- CARL .GLOGAU, OF s'rnrrennr-yenan ,NY.

ARRANGEMENT OF THE FI AMEN FOR HIGH-VOLTAGE" INCANDESCENT ELECTRIC LAMPS OF HIGH EFFICIENCY.

Specificatidn of Iletters Patent.

Patented July 16, 1:907.

Application filed May 17,1907. Serial No. 374,188.

To all whom it may concern:

Be it known that I, CARL GL'oeAU, a citizen of Germany, ,residing at Stuttgart, Seyfferstrasse 59, in the Kingdom of Wiirtemberg and Empire of Germany,

have invented certain new and useful Improvements in the Arrangement of the Filament for High-Voltage Incandescent Electric Lamps-of High Efficiency, of

which the following is a iull, clear, and exact description. The incandescent electric lamps of high efiiciency introduced into commerce hitherto are associated with the drawback that they cannot be manufactured for sufficiently high voltages so as;to applicable for singlein'sertions in electric installations up to 300 volts, and yet retain the usual dimensions of the wellknown pear shaped globe. On-account'of tliis drawback the sphere of application for high efliciency lamps is a limited one, and particularly in electric installations with high lighting voltage." --This disad vantage is removed by the present invention. In the tantalum lamps, the filament-is wound'to and fro-in. a well l-:now manner between two circular series of points of attachment and with highervoltages necessitates a greater length of filamentx T-he neighboring filament parts in such cases'approach very near to one another and on account of the shortening of the filament occurring during'the burning, such pointed angles form at the points of snpport,. that in time neighboring filament parts can easily touch one another. The present invention permits a far greater length of filament'to be used without the filament parts approaching nearer to one another during the burning at the point of support as is the case with the above mentioned tantalum lamps up to 120 volts.

This invention consists of animproved arrangement of the filament and of the points of support for the'filament of an incandescenteleetric lamp, in which. the supports are arranged in circular series of different diameter and the filament wound spirally and continuously upon or .over the supports from terminal to terminahthe points of support of the series of larger diameter alternating with those of smaller diameter whereby the filament strands are separated such distance as to avoid contact with each other when the filamentvaries in length.

When the supporting points are located in circles assumed and shown as at the base and summit of imagined conical figures the distance of the supporting points, or summits of the conical figures from the base may be infinitely great, or infinitely small.

The drawing represents different arrangements or modifications of the incandescent filament all within the scope of the invention.

Figure 1 illustrates in perspective a filament with points indicating three circular groups of supports two of said groups beingot equal diameter, and the third of smaller diameters. Fig. 3 isa perspective viewof a filament similar to that shown in Fig. 1 but of less length. FigsHZ and 4 are plan'hiiews respectively of the filaments shown in Figs. 1 and 2 Fig. 5 is a per-. spective view of afilament in the supporting points are arranged in two smaller and 't'wo la rger circles, the smaller circles being in different horizontal planes from the larg r. Fig.6 isa plan of the lament shown in Fig. 5. Fig. 7 is aperspective view oi a filament in which the supportingpoints are in two larger and two smaller circles, thelatter being in the same horizontal plane with the adjacent larger circle. Fig. 8 is a perform a frustum of'cone. Fig. 9 is a plan view of afila- In1 it arranged in'a horizontal plane. Fig. 10 is a perspective View of a filament with its three groups of supports, corresponding to the arrangement shown in .Fig. 2, the supports being shown as'projecting radially f r0in a central stem. In Fig. 1' the points of support 1, l, 3,- 3, 5, 5, 7, 7, etc, are arrangedin circular series ofthe same diame-,

ter, while the second series of supports 2, 4, 6, 8, 10, etci, are in a circle of less diameter than the others. In order to obtain greater angles in passing the filament over from one circle of supports to another, two smaller circular groups of points of support can be provided as shown in Fig. 5-and when right angles are desired each smaller cir'cle may fall in one horizontal plane with a group or circle of supports of larger-diameter asshownin Fig. 7.

In Fig. 1 an example of the invention is shown in which a length of filament of 1260 millimeters is used. The incandescent filament starts on one current leading point or terminal b runs then to a point of support of the lower, larger circular series, from hereto an up-" per point of supportdenoted in the example shown at l, of the upper larger circular series, and is then led towards the smallercircle of supports, in thie case to the point of support 2 and so forth over 3, 3, 4, 5, 5,

- etc until the filament has reached another current leading point or terminal b. It can be seen from the plan of this lamp given by way of example in Fig.2, that,

firstly, the parts of the filament in theouter surface of the skeleton cylinder formed by the filament do not approach nearer to one another than the dist rnce be-- tween two neighboring filament parts of the previously mentioned tantalum lamps f0r'120 volt-s. Secondly, that in the inner surface, forming the skeleton of two truncated cones placed snmmit to summit, the filament parts approach one another most nearly at the points of support, and diverge towards the outer skeleton cylinder.

Fig. 3 of the drawing represents as a further example a form of construction with a filament of 6501mi11imeters length in which arrangement contrary to'the existing tantalum lamp the compact'arrangement of the filament winding is remarkably conspicuous, al-

though as is obvious from the plan shown in Fig. 4 the neighboring filament parts are no further from one another than in Fig. 2.

It is to be understood that the lamn issimilar to the tantalum or tungsten lamp, except as to the structure and arrangement of the filamentsupports, and the de-v scribed arrangement, oi the-filament winding. The filament may be either made of tantalum, tungsten or other well known material and the supports .d made of suitable material attached to a glass stem A, in the base of which isembedded the leading wires.

In a hignvoltage incandescent electric lamp having a plurality of series of supporting points arranged in several circles of larger end smaller diameter, a filament wound continuously and spirally overthe. supporting points of the several series, and forming two series of circularly dlsposedstrands one within the other, the inner strands alone engaging the supporting points-of the circle of smaller diameter.-

In witness whereof, I subscribe my signature, in presence I of two witnesses.

CARL: GLOGAU.

Witnesses;

Enxnsr Eu'rn'mmnu, flimsy H., MORGAN. 

